Pluggable transport overview links to http://*.iacr.org
https://www.torproject.org/docs/pluggable-transports.html.en
The entry for "Format-Transforming Encryption" links to http://eprint.iacr.org/2012/494 (which is correct)
There's HTTPS available. There's no certificate warning or anything that would prevent using it. (There's no rule for iacr.org in HTTPS-Everywhere, yet)
While I'm not concerned about this, I thought I better report this.